[cocos2dx注意事项014]一个用于cocos2dx对象智能指针模板

//在非常多时候，类的成员是CCObject的子对象，为了保证对其正常使用，又要遵循cocos2dx的内存管理。特实现了这种一个智能指针，方便使用。#ifndef _X_COCOS_PTR_H_#define _X_COCOS_PTR_H_namespace zdh{	template<class T>	class XCocosPtr	{	public:		XCocosPtr()			:m_Object(nullptr)		{}		XCocosPtr(T * paramObject)			:m_Object(paramObject)		{			if (m_Object != nullptr)			{				m_Object->retain();			}		}		XCocosPtr(const XCocosPtr & paramPtr)			:m_Object(paramPtr.m_Object)		{			if (m_Object != nullptr)			{				m_Object->retain();			}		}		~XCocosPtr()		{			ptr_release();		}		//重载赋值运算符		XCocosPtr & operator = (T * paramObject)		{			set(paramObject);			return *this;		}		XCocosPtr & operator = (XCocosPtr & paramObject)		{			set(paramObject.m_Object);			return *this;		}		//重载比較运算符		bool operator == (T * paramObject) const		{			return m_Object == paramObject;		}		bool operator != (T * paramObject) const		{			return m_Object != paramObject;		}		//重载*运算符		T & operator*()		{			return *m_Object;		}		const T & operator*() const		{			return *m_Object;		}		//重载->运算符。使其能够像指针那样使用		T * operator ->()		{			return m_Object;		}		const T * operator ->() const		{			return m_Object;		}		//推断对象是否为空		bool is_null() const		{			return m_Object == nullptr;		}		//推断对象是否为不空		bool is_not_null() const		{			return m_Object != nullptr;		}		//创建对象 这里会使用调用对象的create来创建对象		T * create()		{			T * pNewObject = T::create();			set(pNewObject);			return pNewObject;		}		//设置对象		void set(T * paramObject)		{			if (m_Object != paramObject)			{				T * p = m_Object;				m_Object = paramObject;				if (m_Object != nullptr)				{					m_Object->retain();				}				if (isNotNULL(p))				{					p->release();				}			}		}		//取对象		T * get()		{			return m_Object;		}		//这里没有使用release这个名称。是为了防止和object的release混淆		void ptr_release()		{			if (m_Object != nullptr)			{				m_Object->release();				m_Object = nullptr;			}		}	private:		T * m_Object;	};}#endif

//类的数据成员定义：
XCocosPtr<CCSprite> m_Sprite;
//在init中
m_Sprite = CCSprite::create("");
//要么
m_Sprite.create()